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Development of a System for Controlling Dissolved‐Oxygen Content of Water
Author(s) -
Mount Donald I.
Publication year - 1961
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1961)90[323:doasfc]2.0.co;2
Subject(s) - oxygen , chemistry , fish <actinopterygii> , water flow , volumetric flow rate , water content , effluent , apparent oxygen utilisation , zoology , environmental chemistry , environmental science , environmental engineering , biology , fishery , thermodynamics , geology , physics , organic chemistry , geotechnical engineering
A system for controlling the dissolved‐oxygen content of a continuous flow of water was developed and tested. It is essentially a continuous flow of water through a partial vacuum. Two daily adjustments maintain the dissolved‐oxygen content of the effluent water within 0.05 p.p.m. of the desired concentration. Minimum oxygen content of 0.5 p.p.m. and flow rates greater than 10 liters a minute were obtained. Modifications are suggested to improve the efficiency and capacity of this system. The behavior of four species of fish at reduced oxygen concentrations was observed. When the oxygen content was decreased below 3 p.p.m., ventilation rate and amplitude increased rapidly, activity decreased, normal colors faded, feeding ceased, and the fish became unresponsive to such stimuli as movement and vibration. Oxygen concentrations below 3 p.p.m. appear to be critical for these four species in resting conditions.